Method for welding CV barrel and penetrating part sleeve of AP1000 nuclear power station

Abstract

The invention relates to the field of nuclear power building, in particular to a method for welding a steel safety shell barrel and a penetrating part sleeve mounted on the barrel in an AP1000 nuclear power station, and provides a method for welding a CV barrel and a penetrating part sleeve of an AP1000 nuclear power station to improve the welding efficiency and reducing the defect generation probability on the premise of guaranteeing welding quality. The penetrating part sleeve is hoisted and temporarily fixed into a mounting hole in the CV barrel; bottoming welding is carried out in an inner side groove and an outer side groove of the CV barrel through an argon tungsten-arc welding method; and the azimuth angle of the penetrating part sleeve is measured and calculated, when the deviation alpha of the azimuth angle is larger than 2 degrees, the azimuth angle is adjusted till the deviation alpha of the azimuth angle is smaller than or equal to 2 degrees, and filling welding and cover face welding are alternately carried out on the inner side groove and the outer side groove of the CV barrel through a manual arc welding method till welding is completed. The method is adopted for welding the CV barrel and the penetrating part sleeve of the AP1000 nuclear power station, and therefore the welding quality can be guaranteed, and the construction period can be shortened.

Description

technical field [0001] The invention relates to the field of nuclear power construction, in particular to a method for welding a steel containment shell cylinder in an AP1000 nuclear power plant and a penetrating piece sleeve installed on the cylinder. Background technique [0002] When building an AP1000 nuclear power plant, five mechanical penetrations need to be installed on the steel containment (CV) cylinder in the nuclear island, and the connection method between the external sleeve of these mechanical penetrations and the CV cylinder is as follows figure 1 As shown, the penetration sleeve 1 and the CV cylinder 2 are paired to form a T-shaped joint, and the groove form of the T-shaped joint is a K-shaped groove. [0003] In the prior art, manual arc welding is used at the construction site of the nuclear island to weld the T-shaped joint formed by the penetration sleeve and the CV cylinder. The welding steps are as follows: [0004] First, tack welding is performed on...

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Problems solved by technology

[0008] Although the above welding method can be used to complete the welding of the K-shaped groove between the CV cylinder and the penetration sleeve, however, manual arc welding is used for welding, and defects, especially defects at the root of the weld, will occur during the welding process. The probability increases, consumes a lot of manpower and material resources and the construction period is longer

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